Austenitic addition material for fusion welding



U base material which may common steel or. highlyalloyed steel with high Patented May 2, 1939 PATENT OFFICE AUSTENITIC Franz Rapatz,

assignor to v(lebr. Bi)

ADDITION MATERIAL FOR FUSION WELDING Buderich-Dusseldort, Germany, hler 8; C0. Aktiengesell schaft, Wien, Vienna, Germany No Drawing. Application December 30, 1936, Serial No. 118,262., In Austria January 11, 1936 Claims.

-This invention relates to austenitic addition material for fusion welding of non-austenitic be either unalloyed or low tensile strength.

The invention consists essentially in .the selection, as addition material for austenitic manganese-nickel steels, within certain well defined limits, with or without additions of 'chromium, molybdenum, copper, vanadium, ti-

tantium, tantalum and zirconium.

Austenitic chromium-nickel steels, containing. about 20% chromium and. about 20%, or more, nickel, have heretofore been pose. This invention attains the same result by using steels of far lower alloy content.

To attain this end, a small and limited field in which the required characteristics, 1. e., a tensile strength of 85,340 lbs/sq. in. or more, could be realized, had amongst the many possible 'austenitic steels by diligent research. Anappropriate selection had to be made from amongst the alloying elements nickel, manganese and chromium, to obtain a dendritic crystalline structure and ductility coefficients which do not cause stresses." The choiceof a correct carbon content is of capital importance;

dition, the silicon content definitely influences the crystallinestructure. It has been observed that with increasing silicon content there is a strong tendency towards forming dendritic crystalline structures. A' high silicon content may alsobe maintained in certain cases for other reasons.

The following examples of austenitic alloys were found by experiment .to meet the abovedescribed conditions in the welding of non-aus-' tenitic steels:

O Si Mn Ni Cr Mo Percent Percent Percent Percent Percent Percent 0. 0.08 12. 50 5. 60 3. 80 l. 20 0. l0 0.07 10. 50 6. 00 3. 80 l. 10 0.09 0.09 17.00 11.00 4.00 1.20 Y

0. 10 0.00 12. 00 ll. 00 3. 80 l.

In accordance with the principles disclosed filler material for above, the invention comprises welding steel, and particularly for uniting contiguous members 'of nonaustenltic steel, which filler material is an austenitic nickel-manganese steel-containing, aside from the iron, 0.01% to 0.5%- carbon, 3% to 25% manganese, to nickel, and 0.01% to 3% silicon. Narrower ranges for these ingredients are 0.05% carbon, 8% to 15% manganese, 8% to 4% fusion welding, of

used for this purto bev carefully selected from,

carbon contents between ODS-0.20% have been found to be the most appropriate. In ad- 15% manganese, 8%

steel containing 0.05% to 0.2%

nickel, and 0.01% to 0.2% silicon. Chromium may be present in an amount up to 6%; and molybdenum may be added in an amount up to 15%, preferably between 1% and 3%. The molybdenum content may be entirely or partly replaced by copper, the copper content not exceeding 5% and being preferably between 2% and 3%. The molybdenum content may also be entirely or partly replaced by vanadium, the vanadium content not exceeding 3% and being preferably'betwee'n 0.4% to 1%, or by up to 3% (preferably 0.5% to 1.5% of one or more of the elements titanium, tantalum, and zirconium.

I claim:

.l. A welded joint comprising at least two contiguous non-austenitic steel members united by weld filler material, said filler material being composed of fully austenitic nickel-manganese steel containing 0.01% to 0.2% carbon, 3% to manganese, 20% to 3% nickel, 0.01% to 3% silicon, and the remainder principally iron.

2. A welded joint comprising at least two'contiguous non-austenitic steel members united by weld filler material, said filler material being composed of fully austenitic nickel-manganese steel containing 0.05% to 0.2% carbon, 8% to 15% manganese, 8% to 4% nickel, 0.2% to 3% silicon, and the remainder principally iron.

3. A welded joint comprising at least two .contiguous non-austenitic steel members united by weld filler material, said filler material being composed of fully austenitic nickel-manganese steel containing 0.05% to 0.2% carbon, 8% to to 4%. nickel, 0.2% to 3% silicon,-chromium in an amount not exceeding 6%, and the remainder iron.

4. A welded joint comprising at least two contiguous non-austenitic steel members united by weld filler material, said filler material being composed of fully austenitic nickel-manganese carbon, 8% to 15% manganese, 8% to 4% 'ckel, 0.2% to 3% silicon, substantial amounts not exceeding 3% of at least one metal of the group-consisting of molybdenum, vanadium, titanium, tantalum,

zirconium, and the remainder iron.

5. A welded joint comprising at least two contiguous non-austenitic steel members united by weld filler material, said filler material being composed of fully austenitic nickel-manganese steel containing 0.05% to 0.2% carbon, 8% to 15% manganese, 8% to 4% nickel, 0.2% to 3% silicon, chromium in an amount not exceeding 6%, and 0.5% to 1.5% of at least one metal of. the group consisting of molybdenum, vanadium, titanium, tantalum, zirconium, and the remainder substantially all iron.

, FRANZ RAPATZ. 

